import IIIF from '../../../../src/ol/source/IIIF.js';
import {DEFAULT_TILE_SIZE} from '../../../../src/ol/tilegrid/common.js';
import {Versions} from '../../../../src/ol/format/IIIFInfo.js';

describe('ol.source.IIIF', function () {
  const width = 2000,
    height = 1500,
    size = [width, height],
    url = 'http://iiif.test/image-id';

  function getMinimalSource() {
    return new IIIF({
      size: size,
    });
  }

  function getSource(additionalOptions) {
    const options = Object.assign(
      {},
      {
        size: size,
        url: url,
      },
      additionalOptions === undefined ? {} : additionalOptions
    );
    return new IIIF(options);
  }

  describe('constructor', function () {
    it('requires valid size option', function () {
      expect(function () {
        new IIIF();
      }).to.throwException();

      expect(function () {
        new IIIF({});
      }).to.throwException();

      expect(function () {
        new IIIF({
          size: [],
        });
      }).to.throwException();

      expect(function () {
        new IIIF({
          size: 100,
        });
      }).to.throwException();

      expect(function () {
        new IIIF({
          size: [100],
        });
      }).to.throwException();

      expect(function () {
        new IIIF({
          size: [null, 100],
        });
      }).to.throwException();

      expect(function () {
        new IIIF({
          size: ['very wide', 100],
        });
      }).to.throwException();

      expect(function () {
        new IIIF({
          size: [0, 100],
        });
      }).to.throwException();

      expect(function () {
        new IIIF({
          size: [100, null],
        });
      }).to.throwException();

      expect(function () {
        new IIIF({
          size: [100, 0],
        });
      }).to.throwException();

      expect(function () {
        new IIIF({
          size: [100, 'not that high'],
        });
      }).to.throwException();

      expect(function () {
        new IIIF({
          size: [100, 200, 300],
        });
      }).to.throwException();

      let source;

      expect(function () {
        source = new IIIF({
          size: [100, 200],
        });
      }).to.not.throwException();

      expect(source).to.be.a(IIIF);

      expect(function () {
        getMinimalSource();
      }).to.not.throwException();
    });

    it('uses empty base URL, default quality, jpg format as default', function () {
      const tileUrlFunction = getMinimalSource().getTileUrlFunction();
      expect(tileUrlFunction([0, 0, 0])).to.be('full/full/0/default.jpg');
    });

    it('uses native as default quality for version 1', function () {
      const tileUrlFunction = new IIIF({
        size: size,
        version: Versions.VERSION1,
      }).getTileUrlFunction();
      expect(tileUrlFunction([0, 0, 0])).to.be('full/full/0/native.jpg');
    });

    it('corrects non empty base URL if trailing slash is missing', function () {
      // missing trailing slash is added
      let tileUrlFunction = getSource().getTileUrlFunction();
      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/full/0/default.jpg'
      );

      // existent trailing slash isn't doubled
      tileUrlFunction = getSource({
        url: 'http://iiif.test/other-image-id/',
      }).getTileUrlFunction();
      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/other-image-id/full/full/0/default.jpg'
      );
    });
  });

  describe('tileUrlFunction', function () {
    it('has only one resolution and one tile if no tiles, resolutions, sizes and supported features are given', function () {
      let tileUrlFunction = getSource().getTileUrlFunction();
      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/full/0/default.jpg'
      );
      expect(tileUrlFunction([-1, 0, 0])).to.be(undefined);
      expect(tileUrlFunction([1, 0, 0])).to.be(undefined);
      expect(tileUrlFunction([0, 1, 0])).to.be(undefined);
      expect(tileUrlFunction([0, 0, 1])).to.be(undefined);

      tileUrlFunction = getSource({
        version: Versions.VERSION1,
      }).getTileUrlFunction();
      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/full/0/native.jpg'
      );

      tileUrlFunction = getSource({
        version: Versions.VERSION3,
      }).getTileUrlFunction();
      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/max/0/default.jpg'
      );
    });

    it('constructs the same number of resolutions as distinguishable sizes are given', function () {
      let tileUrlFunction = getSource({
        sizes: [
          [2000, 1500],
          [1000, 750],
          [500, 375],
        ],
      }).getTileUrlFunction();

      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/500,/0/default.jpg'
      );
      expect(tileUrlFunction([1, 0, 0])).to.be(
        'http://iiif.test/image-id/full/1000,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 0])).to.be(
        'http://iiif.test/image-id/full/full/0/default.jpg'
      );
      expect(tileUrlFunction([3, 0, 0])).to.be(undefined);
      expect(tileUrlFunction([-1, 0, 0])).to.be(undefined);
      expect(tileUrlFunction([0, 1, 0])).to.be(undefined);
      expect(tileUrlFunction([0, 0, 1])).to.be(undefined);
      expect(tileUrlFunction([1, 1, 0])).to.be(undefined);
      expect(tileUrlFunction([1, 0, 1])).to.be(undefined);

      tileUrlFunction = getSource({
        sizes: [
          [2000, 1500],
          [1000, 750],
          [500, 375],
        ],
        version: Versions.VERSION3,
      }).getTileUrlFunction();

      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/500,375/0/default.jpg'
      );
      expect(tileUrlFunction([1, 0, 0])).to.be(
        'http://iiif.test/image-id/full/1000,750/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 0])).to.be(
        'http://iiif.test/image-id/full/max/0/default.jpg'
      );

      tileUrlFunction = getSource({
        sizes: [
          [2000, 1500],
          [1000, 749],
          [1000, 750],
          [500, 375],
          [500, 374],
        ],
      }).getTileUrlFunction();

      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/500,/0/default.jpg'
      );
      expect(tileUrlFunction([1, 0, 0])).to.be(
        'http://iiif.test/image-id/full/1000,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 0])).to.be(
        'http://iiif.test/image-id/full/full/0/default.jpg'
      );
      expect(tileUrlFunction([3, 0, 0])).to.be(undefined);

      tileUrlFunction = getSource({
        version: Versions.VERSION3,
        sizes: [
          [2000, 1500],
          [1000, 750],
          [500, 375],
        ],
      }).getTileUrlFunction();

      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/500,375/0/default.jpg'
      );
      expect(tileUrlFunction([1, 0, 0])).to.be(
        'http://iiif.test/image-id/full/1000,750/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 0])).to.be(
        'http://iiif.test/image-id/full/max/0/default.jpg'
      );
      expect(tileUrlFunction([3, 0, 0])).to.be(undefined);
      expect(tileUrlFunction([-1, 0, 0])).to.be(undefined);
      expect(tileUrlFunction([0, 1, 0])).to.be(undefined);
      expect(tileUrlFunction([0, 0, 1])).to.be(undefined);
      expect(tileUrlFunction([1, 1, 0])).to.be(undefined);
      expect(tileUrlFunction([1, 0, 1])).to.be(undefined);
    });

    it('cannot provide scaled tiles without provided tilesize or supported features', function () {
      const tileUrlFunction = getSource({
        resolutions: [16, 8, 4, 2, 1],
      }).getTileUrlFunction();

      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/full/0/default.jpg'
      );
      expect(tileUrlFunction([-1, 0, 0])).to.be(undefined);
      expect(tileUrlFunction([1, 0, 0])).to.be(undefined);
      expect(tileUrlFunction([0, 1, 0])).to.be(undefined);
      expect(tileUrlFunction([0, 0, 1])).to.be(undefined);
    });

    it('provides canonical tile URLs for all necessary resolutions if only a tileSize exists', function () {
      let tileUrlFunction = getSource({
        tileSize: 512,
      }).getTileUrlFunction();

      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/500,/0/default.jpg'
      );
      expect(tileUrlFunction([-1, 0, 0])).to.be(undefined);
      expect(tileUrlFunction([0, 1, 0])).to.be(undefined);
      expect(tileUrlFunction([0, 0, 1])).to.be(undefined);
      expect(tileUrlFunction([1, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,1024,1024/512,/0/default.jpg'
      );
      expect(tileUrlFunction([1, 1, 0])).to.be(
        'http://iiif.test/image-id/1024,0,976,1024/488,/0/default.jpg'
      );
      expect(tileUrlFunction([1, 0, 1])).to.be(
        'http://iiif.test/image-id/0,1024,1024,476/512,/0/default.jpg'
      );
      expect(tileUrlFunction([1, 1, 1])).to.be(
        'http://iiif.test/image-id/1024,1024,976,476/488,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,512,512/512,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 3, 0])).to.be(
        'http://iiif.test/image-id/1536,0,464,512/464,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 2])).to.be(
        'http://iiif.test/image-id/0,1024,512,476/512,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 3, 2])).to.be(
        'http://iiif.test/image-id/1536,1024,464,476/464,/0/default.jpg'
      );
      expect(tileUrlFunction([3, 0, 0])).to.be(undefined);

      tileUrlFunction = getSource({
        tileSize: 512,
        version: Versions.VERSION3,
      }).getTileUrlFunction();

      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/500,375/0/default.jpg'
      );
      expect(tileUrlFunction([1, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,1024,1024/512,512/0/default.jpg'
      );
      expect(tileUrlFunction([1, 1, 0])).to.be(
        'http://iiif.test/image-id/1024,0,976,1024/488,512/0/default.jpg'
      );
      expect(tileUrlFunction([1, 0, 1])).to.be(
        'http://iiif.test/image-id/0,1024,1024,476/512,238/0/default.jpg'
      );
      expect(tileUrlFunction([1, 1, 1])).to.be(
        'http://iiif.test/image-id/1024,1024,976,476/488,238/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,512,512/512,512/0/default.jpg'
      );
      expect(tileUrlFunction([2, 3, 0])).to.be(
        'http://iiif.test/image-id/1536,0,464,512/464,512/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 2])).to.be(
        'http://iiif.test/image-id/0,1024,512,476/512,476/0/default.jpg'
      );
      expect(tileUrlFunction([2, 3, 2])).to.be(
        'http://iiif.test/image-id/1536,1024,464,476/464,476/0/default.jpg'
      );
    });

    it('provides canonical tile URLs for all provided resolutions if a tileSize also exists', function () {
      const tileUrlFunction = getSource({
        tileSize: 512,
        resolutions: [8, 4, 2, 1],
      }).getTileUrlFunction();

      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/250,/0/default.jpg'
      );
      expect(tileUrlFunction([1, 0, 0])).to.be(
        'http://iiif.test/image-id/full/500,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,1024,1024/512,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 1, 0])).to.be(
        'http://iiif.test/image-id/1024,0,976,1024/488,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 1])).to.be(
        'http://iiif.test/image-id/0,1024,1024,476/512,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 1, 1])).to.be(
        'http://iiif.test/image-id/1024,1024,976,476/488,/0/default.jpg'
      );
      expect(tileUrlFunction([3, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,512,512/512,/0/default.jpg'
      );
      expect(tileUrlFunction([3, 3, 0])).to.be(
        'http://iiif.test/image-id/1536,0,464,512/464,/0/default.jpg'
      );
      expect(tileUrlFunction([3, 0, 2])).to.be(
        'http://iiif.test/image-id/0,1024,512,476/512,/0/default.jpg'
      );
      expect(tileUrlFunction([3, 3, 2])).to.be(
        'http://iiif.test/image-id/1536,1024,464,476/464,/0/default.jpg'
      );
      expect(tileUrlFunction([4, 0, 0])).to.be(undefined);
    });

    it('supports non square tiles', function () {
      let tileUrlFunction = getSource({
        tileSize: [1024, 512],
      }).getTileUrlFunction();

      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/500,/0/default.jpg'
      );
      expect(tileUrlFunction([1, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,2000,1024/1000,/0/default.jpg'
      );
      expect(tileUrlFunction([1, 0, 1])).to.be(
        'http://iiif.test/image-id/0,1024,2000,476/1000,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,1024,512/1024,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 1, 0])).to.be(
        'http://iiif.test/image-id/1024,0,976,512/976,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 2])).to.be(
        'http://iiif.test/image-id/0,1024,1024,476/1024,/0/default.jpg'
      );
      expect(tileUrlFunction([2, 1, 2])).to.be(
        'http://iiif.test/image-id/1024,1024,976,476/976,/0/default.jpg'
      );
      expect(tileUrlFunction([3, 0, 0])).to.be(undefined);

      tileUrlFunction = getSource({
        tileSize: [1024, 512],
        version: Versions.VERSION3,
      }).getTileUrlFunction();

      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/500,375/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,1024,512/1024,512/0/default.jpg'
      );
    });

    it('provides tile URLs with default tile size if sufficient supported features are provided', function () {
      let tileUrlFunction = getSource({
        supports: ['regionByPx', 'sizeByW'],
      }).getTileUrlFunction();

      const maxZoom = Math.ceil(Math.log2(width / DEFAULT_TILE_SIZE));

      expect(tileUrlFunction([maxZoom, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,' +
          DEFAULT_TILE_SIZE +
          ',' +
          DEFAULT_TILE_SIZE +
          '/' +
          DEFAULT_TILE_SIZE +
          ',/0/default.jpg'
      );
      expect(tileUrlFunction([maxZoom + 1, 0, 0])).to.be(undefined);

      tileUrlFunction = getSource({
        supports: ['regionByPx', 'sizeByH'],
      }).getTileUrlFunction();

      expect(tileUrlFunction([maxZoom, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,' +
          DEFAULT_TILE_SIZE +
          ',' +
          DEFAULT_TILE_SIZE +
          '/,' +
          DEFAULT_TILE_SIZE +
          '/0/default.jpg'
      );
      expect(tileUrlFunction([maxZoom + 1, 0, 0])).to.be(undefined);

      tileUrlFunction = getSource({
        supports: ['regionByPx', 'sizeByWh'],
      }).getTileUrlFunction();

      expect(tileUrlFunction([maxZoom, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,' +
          DEFAULT_TILE_SIZE +
          ',' +
          DEFAULT_TILE_SIZE +
          '/' +
          DEFAULT_TILE_SIZE +
          ',' +
          DEFAULT_TILE_SIZE +
          '/0/default.jpg'
      );
      expect(tileUrlFunction([maxZoom + 1, 0, 0])).to.be(undefined);

      tileUrlFunction = getSource({
        supports: ['regionByPct', 'sizeByPct'],
      }).getTileUrlFunction();

      const tileWPct = ((DEFAULT_TILE_SIZE / width) * 100).toLocaleString(
          'en',
          {maximumFractionDigits: 10}
        ),
        tileHPct = ((DEFAULT_TILE_SIZE / height) * 100).toLocaleString('en', {
          maximumFractionDigits: 10,
        });

      expect(tileUrlFunction([maxZoom, 0, 0])).to.be(
        'http://iiif.test/image-id/pct:0,0,' +
          tileWPct +
          ',' +
          tileHPct +
          '/pct:100/0/default.jpg'
      );
      expect(tileUrlFunction([maxZoom + 1, 0, 0])).to.be(undefined);
    });

    it('prefers canonical tile URLs', function () {
      let tileUrlFunction = getSource({
        tileSize: 512,
        supports: [
          'regionByPx',
          'regionByPct',
          'sizeByW',
          'sizeByH',
          'sizeByWh',
          'sizeByPct',
        ],
      }).getTileUrlFunction();

      expect(tileUrlFunction([2, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,512,512/512,/0/default.jpg'
      );

      tileUrlFunction = getSource({
        tileSize: 512,
        version: Versions.VERSION3,
        supports: [
          'regionByPx',
          'regionByPct',
          'sizeByW',
          'sizeByH',
          'sizeByWh',
          'sizeByPct',
        ],
      }).getTileUrlFunction();

      expect(tileUrlFunction([2, 0, 0])).to.be(
        'http://iiif.test/image-id/0,0,512,512/512,512/0/default.jpg'
      );
    });

    it('provides correct tile URLs for percentage URL parameter values', function () {
      const tileUrlFunction = getSource({
        tileSize: 512,
        supports: ['regionByPct', 'sizeByPct'],
      }).getTileUrlFunction();

      expect(tileUrlFunction([0, 0, 0])).to.be(
        'http://iiif.test/image-id/full/pct:25/0/default.jpg'
      );
      expect(tileUrlFunction([-1, 0, 0])).to.be(undefined);
      expect(tileUrlFunction([0, 1, 0])).to.be(undefined);
      expect(tileUrlFunction([0, 0, 1])).to.be(undefined);

      expect(tileUrlFunction([1, 0, 0])).to.be(
        'http://iiif.test/image-id/pct:0,0,51.2,68.2666666667/pct:50/0/default.jpg'
      );
      expect(tileUrlFunction([1, 1, 0])).to.be(
        'http://iiif.test/image-id/pct:51.2,0,48.8,68.2666666667/pct:50/0/default.jpg'
      );
      expect(tileUrlFunction([1, 0, 1])).to.be(
        'http://iiif.test/image-id/pct:0,68.2666666667,51.2,31.7333333333/pct:50/0/default.jpg'
      );
      expect(tileUrlFunction([1, 1, 1])).to.be(
        'http://iiif.test/image-id/pct:51.2,68.2666666667,48.8,31.7333333333/pct:50/0/default.jpg'
      );

      expect(tileUrlFunction([2, 0, 0])).to.be(
        'http://iiif.test/image-id/pct:0,0,25.6,34.1333333333/pct:100/0/default.jpg'
      );
      expect(tileUrlFunction([2, 3, 0])).to.be(
        'http://iiif.test/image-id/pct:76.8,0,23.2,34.1333333333/pct:100/0/default.jpg'
      );
      expect(tileUrlFunction([2, 0, 2])).to.be(
        'http://iiif.test/image-id/pct:0,68.2666666667,25.6,31.7333333333/pct:100/0/default.jpg'
      );
      expect(tileUrlFunction([2, 3, 2])).to.be(
        'http://iiif.test/image-id/pct:76.8,68.2666666667,23.2,31.7333333333/pct:100/0/default.jpg'
      );
      expect(tileUrlFunction([3, 0, 0])).to.be(undefined);
    });
  });
});